css篇之absolute绝对定位元素居中技巧

<div class='box>
    <div class='jz'></div>
</div>

div.box{
   position: relative;
   height: 300px;
   background: #989eaa;
}
div.fz{
   width: 100px;
   height: 100px;
   background: #499682;
   position: absolute;
   top:0;
   left: 0;
   right: 0;
   bottom: 0;
   margin:auto;
}

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